Hybrid Tank Question

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This question has probably been asked before, but I have a question about Paladin vs Shadowknight classes. Do to my work schedule and family commitments my playtimes can be limited and due to a 2 1/2 year old, grouping isn't always possible. At the moment I have a level 8 Dwarf Paladin and I was thinking about making a Dark Elf Shadowknight. So my question is which one is better for soloing level appropriate content when grouping isn't an option? Thanks.